Fraction Calculator
Add, subtract, multiply, or divide fractions with instant results. Enter fractions as numerator/denominator pairs. Results are shown as simplified fractions and decimals. Free online fraction calculator for homework, cooking, and everyday math.
Fraction calculator
Result
What is this?
A fraction calculator performs arithmetic on fractions: addition, subtraction, multiplication, and division. It finds common denominators when needed and simplifies results to lowest terms. Fractions represent parts of a whole (e.g., 3/4 means three quarters). The calculator handles mixed numbers and improper fractions, and it shows both the simplified fraction and the decimal equivalent so you can verify your answer. No need to find common denominators by hand or simplify with prime factorization—the tool does it instantly.
When to use
Use for homework, cooking (halving or doubling recipes), measurements (inches, cups), and any situation involving fractional amounts. Example: add 1/2 cup and 1/3 cup, or find 2/3 of 90. Bakers frequently need to scale recipes: doubling 2/3 cup requires knowing 2/3 × 2 = 4/3 = 1 1/3 cups. Carpenters use fractions for measurements. Students use it to check their work on fraction problems.
How to use
Enter two fractions as numerator/denominator pairs. Choose add, subtract, multiply, or divide. Results are shown as simplified fractions and decimals.
Formulas
- Add: a/b + c/d = (ad + bc) / bd
- Subtract: a/b − c/d = (ad − bc) / bd
- Multiply: a/b × c/d = ac / bd
- Divide: a/b ÷ c/d = ad / bc
Frequently asked questions
- Find a common denominator: a/b + c/d = (ad + bc) / bd. For example, 1/2 + 1/3 = (3+2)/6 = 5/6.
- Multiply numerators and denominators: a/b × c/d = ac / bd. For example, 1/2 × 2/3 = 2/6 = 1/3.